Refinement of programmers for guaranteed programming of PCF8582 microcircuits. Scheme, description

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Refinement of programmers for guaranteed programming of PCF8582 microcircuits. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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When repairing electronic equipment, it is often necessary to replace non-volatile memory chips (EEPROM). As a rule, the operability of an electronic device is restored only after pre-programming the microcircuit with certain information specific to this model.

Currently, equipment for various purposes uses EEPROMs with an external interface I²C, in particular, microcircuits of the 24cXX series from various manufacturers.

There are many PC-controlled programmers that allow you to program EEPROMs and PIC controllers. As an example, programmers PonyProg, IcProg, EasyProg and others can be cited. The hardware part of the programmer is a device that coordinates between the port of a personal computer and the programmable microcircuit. Various circuit implementations differ from each other mainly only in greater or lesser redundancy and the type of computer interface used - parallel or serial.

Programming of most microchips does not cause difficulties. However, when programming chips like PCF8582 from PHILIPS SEMICONDUCTORS using the I²C, sometimes the chip is not programmable.

The reason for this can be explained as follows: the internal architecture of the PCF8582 chip is somewhat different from the architecture of the 24cXX series chips and requires an additional synchronization signal during the write operation to the memory cells (pin 7 of the RTS chip). The developers of this microcircuit provide 2 ways to synchronize the erase/write unit of the microcircuit:

the use of external synchronization of the erase / write cycles by applying an external clock signal to the pin. 7;
the use of a built-in clock generator, to activate which to the pin. 7 of the microcircuit, an external RC circuit is connected (see figure).

Fig. 1

PCF8582 chip pinout

There is no need to consider in detail the operation of the internal components of the microcircuit. It should only be noted that for normal operation of the PCF8582 chip in all modes using an internal clock generator, the manufacturer recommends maintaining the write / erase cycle duration from 7 to 10 ms.

To do this, the parameters of the RC circuit must be as follows: R = 22 kOhm, C = 2200 pF.

It should be noted that many people program the PCF8582 chip by selecting it in the menu, like 24cO2, and when it is installed in the programmer panel, the pin. 7 is left free. But, as already mentioned, the result is not always positive.

Connecting an external RC circuit with the specified parameters ensures the formation of internal clock signals for erasing/writing, which guarantee stable operation of many programmer software shells with microcircuits of this type.

Thus, in order to refine existing programmers designed for programming 24c02 microcircuits, it is necessary to disconnect the pin. 7 of the installation panel from the common wire and connect the RC circuit to it according to the figure. In addition, between vyv. 7 and with a common wire, it is necessary to install switch B1 (see Fig.). In the closed state of switch B1, the programmer provides programming of 24cXX microcircuits, and in the open state - PCF8582.

The expediency, simplicity and usefulness of this technical solution is confirmed by positive feedback from equipment repair specialists.

Author: S. Zotov; Publication: cxem.net

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